Filter.



I. TIBIAIIR.

nrmnxol run 2n. n, am.

Patented Sept 22, 1908.

Fig.1.

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FRITZ TIEMANN, OF BERLIN, GERMANY.

FILTER.

Specification o! Letter-l Patent.

Patented Sept. 22, 1908.

Application Sled February 84, 1000. lertal 110. 417,816.

To all whom. it may concern Be it known that I, Fnrrz 'liicuaxs a subject of the King of Prussia, German Empire residing at Berlin, Germany,have inveiitei newaiid useful Improvements in Filters, of which thefollowing is a specification.

This invention rcliites'to a filter which is so constructed that thefiltering material contained therein may be readily and eil'ectivciycleaned in a novel nuinner. For this pu iose the filtering material isinclosed in a ho low plunger which is at rest during the filtering'operatioii. When, however, the filtering material is to be cleaned, theplunger is reciprocatcd toforce the water into the plunger and throughthe filtering material.

In the accompanying drawings: Figure l is 'a vertical section through myimproved filter; Fi 2 an enlarged section througha modification of themelting between plun er and cylinder, and ig. 3 a similar sectionthrough a further modification.

A shell or cylinder (1, is' provided with a concave bottom 11 and abulged to d. \Vithin cylinder d, is inclosed a cyliini container orplunger 1:, the outer diameter of which is smaller than the innerdiameter of cylinder at, so that. an annular clearance o", is formedbetween them. Plunger u, is celltercd within cylinder (1, by a series ofguide rollers 1', while upper rim a, of vessel a, engages a packing ringg, secured to cylinder d.

lunger a, is open on top and is provided with a perforatedbottoiii b,curved concentric to bottom dflof c linder d. To head a, of vessel a, issccuret a bail it, fast on the lower end of a vertical red It. Thelatter passes through a suitable stuffing box d, of cover (1, andreceives reciprocating movement. by any suitable means,- (not shown),for a u use hereinafter described. Plunger a, is fi led with pulp orfiltering material, an ported u n perforated bottom b.

to llqlllt to be filtered enters up ier compartnient d, of cylinder d,above. piungeru, throu h an inlet valve 1'. It thence flows into ilinger u, and through the filtering ina teria contained therein, to passthrough perforated bottom b, into the lower'part a, of cylinder (1. Thetiltrate is finally dischar ed from the aiparatns by a valve-controllialoutlet 1. I uring tliisoperatluli any direct ilow of the liquid frommnipartment (1, into annular iace a, is prevented by packing rm 9. whichdivides the space surrounding piston "his ring constitutes a partition,

nected to a cheek-valve f, containing ballf.

Cylinder (l, is further provided near its bottom with a cock m, for thedischarge of the cleaning water remaining in the cylinder after thecleaning operation has been finished.

If it is desired to clean the filtering material, valves k, l, and cockin, must be closed, while valves 12, and o, are opened. Plunger a, isnow vertically reci irocated by red h. It will be seen that at car i upstroke of plunger (I, water is sucked through valve 0, into thecommunicating spaces a, a. At the succeeding down stroke, check-valve a,will close inlet a, so that the water is forced to pass upwards throughla-rfoi'ated bottom I), and through the filtering material contained inplun er 41. By repeating this operation a suita'lile number of times,the filtering material will be thorough! "cleaned.

When the water discharged from valve f, runs sufficiently clean,reciprocating rod h, is arrested, valves a, and o, are closed, and cockm, is opened to permit the dischar 'e of the cleaning'water fromcylinder (1. alve m, is finally closed, and valves 7;, and Z, are 0icned, to re-start the filtering process, as a iove described.

In Fig. 2, rim a, of plunger a, en ages a packing ring 1 made preferablyof se -l\ |l)l:1- eating material. Ring 9', is received within acircumferential groove 11, of cylinder head (1', and is engaged bya ringp, which is forced inwards by a. suitable pressure medium such as waterunder pressure entering groove it, throu h duct q.

In *ig. 3, space 0", and compartment 41",

are shown to be separated by a flexible dia-' lower water ehnmherbetween cylinder and I In witness whereof I have hereunto signed ihmger,a pm'tition intermediate said ehammy mune in the prvmm-v at twosubscribing rs, a water inlet and a vnlvc't'untrullt'tl l witnesses.

FRITZ 'lll*l.\l. \.\'f\'.

water outlet eomnmnicatin with the upper eluunlwr, and. a water nutl tand n vnlvv- Winn-mm:

controlled water inlet comnnmicnting, with llnxm' "ASH-2R, the lowerchamber, substantially as specified. WmJn-Lmu: lliu'r'r.

